Title:
DISTRIBUTED HYDROPHONE BASED ON ULTRA STRONG BENDING-RESISTANT FLEXIBLE OPTICAL CABLE CONTAINING MULTI-CORE OPTICAL FIBER
Document Type and Number:
WIPO Patent Application WO/2021/036580
Kind Code:
A1
Abstract:
A distributed hydrophone based on an ultra strong bending-resistant flexible optical cable containing multi-core optical fibers, which relates to the fields of optical fiber sensing and hydrophones. The hydrophone comprises a distributed optical fiber hydrophone (201) and an ultra strong bending-resistant flexible optical cable (101) containing multi-core optical fibers, which are sequentially connected. The optical cable (101) comprises a central support layer (802), p multi-core optical fibers (804) and an outer protective layer (801); each multi-core optical fiber (804) comprises q fiber cores and is sleeved with a closely wrapped casing (803), and the p multi-core optical fibers (804) wind in a spiral around the central support layer (802) at equal intervals in the same direction; the distributed optical fiber hydrophone (201) comprises a pulse modulation module (302), a demultiplexing module (306) and a multiplexing module (303), and frequency division multiplexing is performed on each time division channel while space division multiplexing is performed on signals in the multiple multi-core optical fibers (804). Space division multiplexing and frequency division multiplexing are combined, and thus the frequency response range of the system for external acoustic waves is substantially increased to meet requirements for the hydrophone. The flexible optical cable (101) substantially improves the sensitivity to external acoustic pressure. Meanwhile, costs are low, sensitivity is the same at each position, and the hydrophone is applicable to long-distance monitoring and large-scale networking.
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Inventors:
RAO YUNJIANG (CN)
FU YUN (CN)
FU YUN (CN)
Application Number:
PCT/CN2020/103031
Publication Date:
March 04, 2021
Filing Date:
July 20, 2020
Export Citation:
Assignee:
ZHEJIANG LAB (CN)
International Classes:
G01V1/18; G01H9/00
Foreign References:
| CN110456410A | 2019-11-15 | |||
| CN109489801A | 2019-03-19 | |||
| CN106840356A | 2017-06-13 | |||
| CN106768281A | 2017-05-31 | |||
| CN109061720A | 2018-12-21 | |||
| CN108288999A | 2018-07-17 | |||
| US20130250724A1 | 2013-09-26 |
Attorney, Agent or Firm:
HANGZHOU QIUSHI PATENT OFFICE CO., LTD (CN)
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